ИСТИНА

The multi-year photometric observations of the weak line T Tauri star V715 Per in optical (V RI) and near infrared (JHK) bands have revealed an unusual combination of two different types of the photometric activity: low amplitude periodic brightness changes with P = 5.23 days and algol-like minima which are typical for the UX Ori stars. The minima have been observed during about 6 years and then have suddenly stopped. The periodic variability of this objects was observed earlier by Cohen et al. (2004) and interpreted as a rotational brightness modulation of a spotted star. We argue that the physics of this phenomenon is similar to that suggested by Bouvier et al. (1999) for the classical T Tauri star AA Tau: periodic occultation of the star by the warped inner disk. The observations have shown that the amplitude of the periodic brightness variations decreased at the time when the star demonstrated the UX Ori type activity. We argue that both these phenomena were caused by the temporary increase of the mass accretion rate onto the star, that led to reduction of the warped inner disk radius.